The confusion, as clarified elsewhere between GP and I in this thread, lies in the fact that you don't usually see an actual "all you can eat conveyor belt sushi" restaurant - they traditionally charge by the plate but you're welcome to order as much as you want. In point of fact, the restaurant OP went to bucked that trend and was actually a flat-fee conveyor belt joint.
This will be amusing - how did you make it this far into this chain, past my first comment that contained my edit explaining how I made this mistake? Unless you're just being a dick for the sake of being a dick, of course...
